1 /* 2 * Asus Wireless Radio Control Driver 3 * 4 * Copyright (C) 2015-2016 Endless Mobile, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/types.h> 15 #include <linux/acpi.h> 16 #include <linux/input.h> 17 #include <linux/pci_ids.h> 18 #include <linux/leds.h> 19 20 struct hswc_params { 21 u8 on; 22 u8 off; 23 u8 status; 24 }; 25 26 struct asus_wireless_data { 27 struct input_dev *idev; 28 struct acpi_device *adev; 29 const struct hswc_params *hswc_params; 30 struct workqueue_struct *wq; 31 struct work_struct led_work; 32 struct led_classdev led; 33 int led_state; 34 }; 35 36 static const struct hswc_params atk4001_id_params = { 37 .on = 0x0, 38 .off = 0x1, 39 .status = 0x2, 40 }; 41 42 static const struct hswc_params atk4002_id_params = { 43 .on = 0x5, 44 .off = 0x4, 45 .status = 0x2, 46 }; 47 48 static const struct acpi_device_id device_ids[] = { 49 {"ATK4001", (kernel_ulong_t)&atk4001_id_params}, 50 {"ATK4002", (kernel_ulong_t)&atk4002_id_params}, 51 {"", 0}, 52 }; 53 MODULE_DEVICE_TABLE(acpi, device_ids); 54 55 static u64 asus_wireless_method(acpi_handle handle, const char *method, 56 int param) 57 { 58 struct acpi_object_list p; 59 union acpi_object obj; 60 acpi_status s; 61 u64 ret; 62 63 acpi_handle_debug(handle, "Evaluating method %s, parameter %#x\n", 64 method, param); 65 obj.type = ACPI_TYPE_INTEGER; 66 obj.integer.value = param; 67 p.count = 1; 68 p.pointer = &obj; 69 70 s = acpi_evaluate_integer(handle, (acpi_string) method, &p, &ret); 71 if (ACPI_FAILURE(s)) 72 acpi_handle_err(handle, 73 "Failed to eval method %s, param %#x (%d)\n", 74 method, param, s); 75 acpi_handle_debug(handle, "%s returned %#llx\n", method, ret); 76 return ret; 77 } 78 79 static enum led_brightness led_state_get(struct led_classdev *led) 80 { 81 struct asus_wireless_data *data; 82 int s; 83 84 data = container_of(led, struct asus_wireless_data, led); 85 s = asus_wireless_method(acpi_device_handle(data->adev), "HSWC", 86 data->hswc_params->status); 87 if (s == data->hswc_params->on) 88 return LED_FULL; 89 return LED_OFF; 90 } 91 92 static void led_state_update(struct work_struct *work) 93 { 94 struct asus_wireless_data *data; 95 96 data = container_of(work, struct asus_wireless_data, led_work); 97 asus_wireless_method(acpi_device_handle(data->adev), "HSWC", 98 data->led_state); 99 } 100 101 static void led_state_set(struct led_classdev *led, enum led_brightness value) 102 { 103 struct asus_wireless_data *data; 104 105 data = container_of(led, struct asus_wireless_data, led); 106 data->led_state = value == LED_OFF ? data->hswc_params->off : 107 data->hswc_params->on; 108 queue_work(data->wq, &data->led_work); 109 } 110 111 static void asus_wireless_notify(struct acpi_device *adev, u32 event) 112 { 113 struct asus_wireless_data *data = acpi_driver_data(adev); 114 115 dev_dbg(&adev->dev, "event=%#x\n", event); 116 if (event != 0x88) { 117 dev_notice(&adev->dev, "Unknown ASHS event: %#x\n", event); 118 return; 119 } 120 input_report_key(data->idev, KEY_RFKILL, 1); 121 input_sync(data->idev); 122 input_report_key(data->idev, KEY_RFKILL, 0); 123 input_sync(data->idev); 124 } 125 126 static int asus_wireless_add(struct acpi_device *adev) 127 { 128 struct asus_wireless_data *data; 129 const struct acpi_device_id *id; 130 int err; 131 132 data = devm_kzalloc(&adev->dev, sizeof(*data), GFP_KERNEL); 133 if (!data) 134 return -ENOMEM; 135 adev->driver_data = data; 136 data->adev = adev; 137 138 data->idev = devm_input_allocate_device(&adev->dev); 139 if (!data->idev) 140 return -ENOMEM; 141 data->idev->name = "Asus Wireless Radio Control"; 142 data->idev->phys = "asus-wireless/input0"; 143 data->idev->id.bustype = BUS_HOST; 144 data->idev->id.vendor = PCI_VENDOR_ID_ASUSTEK; 145 set_bit(EV_KEY, data->idev->evbit); 146 set_bit(KEY_RFKILL, data->idev->keybit); 147 err = input_register_device(data->idev); 148 if (err) 149 return err; 150 151 for (id = device_ids; id->id[0]; id++) { 152 if (!strcmp((char *) id->id, acpi_device_hid(adev))) { 153 data->hswc_params = 154 (const struct hswc_params *)id->driver_data; 155 break; 156 } 157 } 158 if (!data->hswc_params) 159 return 0; 160 161 data->wq = create_singlethread_workqueue("asus_wireless_workqueue"); 162 if (!data->wq) 163 return -ENOMEM; 164 INIT_WORK(&data->led_work, led_state_update); 165 data->led.name = "asus-wireless::airplane"; 166 data->led.brightness_set = led_state_set; 167 data->led.brightness_get = led_state_get; 168 data->led.flags = LED_CORE_SUSPENDRESUME; 169 data->led.max_brightness = 1; 170 err = devm_led_classdev_register(&adev->dev, &data->led); 171 if (err) 172 destroy_workqueue(data->wq); 173 174 return err; 175 } 176 177 static int asus_wireless_remove(struct acpi_device *adev) 178 { 179 struct asus_wireless_data *data = acpi_driver_data(adev); 180 181 if (data->wq) { 182 devm_led_classdev_unregister(&adev->dev, &data->led); 183 destroy_workqueue(data->wq); 184 } 185 return 0; 186 } 187 188 static struct acpi_driver asus_wireless_driver = { 189 .name = "Asus Wireless Radio Control Driver", 190 .class = "hotkey", 191 .ids = device_ids, 192 .ops = { 193 .add = asus_wireless_add, 194 .remove = asus_wireless_remove, 195 .notify = asus_wireless_notify, 196 }, 197 }; 198 module_acpi_driver(asus_wireless_driver); 199 200 MODULE_DESCRIPTION("Asus Wireless Radio Control Driver"); 201 MODULE_AUTHOR("João Paulo Rechi Vita <jprvita@gmail.com>"); 202 MODULE_LICENSE("GPL"); 203